The invention relates to the field of kitchen and bathroom, in particular to a method for arranging water supply and drainage of kitchen and bathroom. The method includes such steps as 1) centrally arranging water supply riser and drainage riser close to wash basin, tighten that distance between water supply risers and drainage risers, and reducing the number of risers occupying more positions onlimited wall surface; 2) the household horizontal branch pipes of the water supply system are often connected with the water meters of the users, in order to reduce the length of the household branchpipes, the washing basin should be located close to the water supply and drainage standpipes and arranged relatively centrally; 3) the faucet above the washing basin is 1.1 m away from the ground, andthe rational design of the water supply and drainage pipelines and interfaces in the kitchen and toilet of the residence is put forward, which provides certain reference value for the design of the residence in our country, and has certain practical significance for promoting the standardization, industrialization and serialization of the kitchen and toilet equipment of the residence in our country at the same time.